# Relationship history for MSHA mine 4607240

Current hierarchy: **Joby  Fields → Preparation Maintenance Inc → Mine No 3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cedar Mining Inc → Mine No 3; 1986-12-01 to 1987-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Goff Mauriene → Mine No 3; 1986-12-01 to 1987-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Goff Mauriene → Cedar Mining Inc; 1986-12-01 to 1987-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Mate Creek Development Company → Mine No 3; 1987-07-06 to 1987-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Joby  Fields → Mine No 3; 1987-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joby  Fields → Mate Creek Development Company; 1987-07-06 to 1987-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Carbon Inc → Mine No 3; 1987-12-22 to 1990-03-11; source msha-controller-operator-history
- **controller_controls_mine:** James  Taylor et al → Mine No 3; 1987-12-22 to 1990-03-11; source msha-controller-operator-history
- **controller_controls_operator:** James  Taylor et al → Cedar Carbon Inc; 1987-12-22 to 1990-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Joby  Fields → Mine No 3; 1988-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preparation Maintenance Inc → Mine No 3; 1990-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joby  Fields → Preparation Maintenance Inc; 1990-03-12 to current/open; source msha-controller-operator-history